NOVELTY - A masson pine forest stress tolerance and productivity improving method involves digging pit at a middle position of connecting line between every two adjacent trees in a transverse and longitudinal direction, when masson pine is arranged in a matrix or a array, followed by fertilizing mycorrhizal fertilizer and organic fertilizer around each tree once in a year during april, where every two adjacent trees in a transverse and longitudinal direction shares one pit, and the mycorrhizal fertilizer is prepared by mixing mycorrhiza fungicide and naphthylacetic acid or indole-3-acetic acid solution.    USE - Method for improving masson pine forest stress tolerance and productivity.    ADVANTAGE - The method enables improving masson pine forest stress tolerance and productivity with improved soil condition and micro ecology environment, improved survival rate and growth rate of the masson pines, and reduced rich water loss.    DETAILED DESCRIPTION - A masson pine forest stress tolerance and productivity improving method involves digging pit at middle position of connecting line between every two adjacent trees in a transverse and longitudinal direction, when masson pine is arranged in a matrix or a array, followed by fertilizing mycorrhizal fertilizer and organic fertilizer around each tree once in a year during april, where every two adjacent trees in a transverse and longitudinal direction shares one pit, each tree is surrounded by four pits, and the distance between each pit and tree trunks is 0.9-2.0 m, the mycorrhizal fertilizer is prepared by mixing mycorrhiza fungicide and naphthylacetic acid or indole-3-acetic acid solution at a weight ratio of 800-1000:1, the mycorrhiza fungicide is obtained by fermenting Lactarius subdulcis, Lactarius akahatsu and Lactarius hatsudake through solid fermentation stock culture, and the concentration of the naphthylacetic acid or indole-3-acetic acid solution is 900 ppm. The Lactarius subdulcis, Lactarius akahatsu and Lactarius hatsudake is treated in a solid culture medium and liquid culture medium before solid fermentation stock culture to obtain the bacterial liquid. The bacterial liquid is inoculated to solid fermentation culture medium comprising grass peat, bran, corn powder and sucrose at a mass ratio of 20-30: 10-15: 5-10: 1, followed by performing fermentation at 25-28 degrees C for 7-12 days, where the concentration of the bacterial liquid is 4-6% of the concentration of the solid fermentation culture medium, followed by preparing liquid culture medium without agarophyte phospholipid. The Lactarius subdulcis, Lactarius akahatsu and Lactarius hatsudake is cut on bevel cut orange solid plate using sterile punching device with diameter of 6 mm into block. The 250 ml liquid culture medium is inoculated into a 500 ml triangular bottle comprising 3-5 blocks. The bottle is placed in water bath shaking table at 25-28 degrees C and rotating speed of 200-220 rpm/minute to cultivate for 7-10 days to obtain bacterial liquid. The Lactarius subdulcis, Lactarius akahatsu and Lactarius hatsudake are collected for masson pine forest. The organic fertilizer is obtained by fermenting bio-organic fertilizer and mixing straw and manure.