【目的】 明确不同规格防虫网对豇豆蓟马的阻隔作用，测定防虫网覆盖对田间小气候环境的影响，旨在为防虫网的选择应用提供参考。【方法】 测定了4种规格的防虫网对豇豆蓟马的阻隔效果，并采用光照计、风速仪和温湿度记录仪等仪器测定了防虫网对光照、通风和温湿度的影响。【结果】 在4种规格的防虫网中，80目防虫网对豇豆蓟马的阻隔效果最高，蓟马穿透率小于10%，60目防虫网次之，20和40目防虫网的阻隔效果较弱。综合考虑防虫和通风，选择覆盖60目防虫网后，相较于露地，棚内蓟马发生量显著小于露地蓟马发生量（P<0.01）；棚内光照强度和风速显著降低（P<0.01），棚内光照强度平均降低192.42 lx，棚内棚边、棚中部和行间位置风速平均分别降低0.59、0.86和0.98 m/s。覆盖防虫网对棚内温湿度有一定影响，相较于露地，在12:00-20:00之间棚内温度显著增高（P<0.01），棚内棚边、棚中部和行间位置温度平均分别升高2.81、2.23和3.09 ℃。在12:00前和20:00后棚内湿度显著增高（P<0.01），棚内棚边、棚中部和行间位置湿度平均分别升高4.66%、7.11%和7.44%；在12:00-20:00之间棚内湿度显著降低（P<0.01），棚内棚边、棚中部和行间位置湿度平均分别降低7.63%、3.53%和5.80%。【结论】 室内试验表明80目防虫网对豇豆蓟马阻隔效果最佳，但田间实际应用推荐60目防虫网，因其在保证有效阻隔蓟马的同时兼顾通风需求。此外，覆盖防虫网会改变田间小气候环境，导致光照和风速降低，并在不同时段对温湿度产生明显影响。

 [Aim]  To clarify the barrier effects of different sized of insect-proof mesh on cowpea thrips, and to determine the impact of mesh on field microclimate, aiming to provide references for the selection and application of insect-proof screens. [Methods]  The effect of four sizes of insect-proof mesh on the abundance of cowpea thrips was measured and the effect of different sized mesh on aspects of the crop microclimate, such as light, ventilation, temperature and humidity, was measured using light meters, anemometers, and temperature and humidity recorders. [Results]  Eighty mesh insect-proof screen was the most effective barrier to cowpea thrips, with less than 10% of the thrips passed through, followed by the 60-mesh screen. Twenty and 40-mesh screens were relatively weak barriers. Considering the importance of excluding insects but also allowing adequate ventilation, the 60-mesh insect-proof screen was selected for field trials. The results indicate significantly lower thrip numbers than in an unscreened control site (P<0.01). Light intensity and wind speed inside the mesh were significantly reduced (P<0.01), with an average decrease in light intensity of 192.42 lx. Average wind speed at the edge of the mesh decreased by 0.59 m/s, and the average wind speed in the middle of the enclosure decreased by 0.86 m/s. The average wind speed between rows decreased by 0.98 m/s. Enclosing cowpea crops with insect-proof screens affects the temperature and humidity inside the enclosure. Compared to an open field, the temperature inside the mesh significantly increased between 12:00 and 20:00 (P<0.01). Average temperature increased by 2.81 ℃ at the edge of the enclosure, by 2.23 ℃ in the middle and by 3.09 ℃ between rows. Humidity inside enclosures significantly increased before 12:00 and after 20:00 (P<0.01), with an average increase of 4.66% at the edge, 7.11% at the middle, and 7.44% between rows. However, between 12:00 and 20:00, the humidity inside the enclosure significantly decreased (P<0.01), with an average decrease of 7.63% at the edge, 3.53% in the middle, and 5.80% between rows. [Conclusion]  The laboratory tests demonstrated that the 80-mesh insect-proof screen provided the best barrier effect against cowpea thrips. However, for practical field application, the 60-mesh screen is recommended as it balances the requirements of excluding pests with maintaining proper ventilation. Additionally, the use of insect-proof screen alters the microclimate conditions in fields, resulting in reduced light intensity and wind speed, along with noticeable variations in temperature and humidity during different time periods.