| Taking Longli No.4 as the experimental material, the effects of soil conditioner PAM application depth (PAM0-10: 0~10 cm from the surface, PAM10-20: 10~20 cm from the surface, PAM20-30: 20~30 cm from the surface, PAM0-30: 0~30 cm from the surface ) on the root growth, leaf osmotic adjustment substance content, plant biomass and yield of quinoa under different degrees of saline\|alkali stress (S1: mild saline\|alkali stress, S2: moderate saline\|alkali stress, S3: severe saline\|alkali stress ) were studied by root canal soil column cultivation. The results showed that when the depth of PAM application was 0~10 cm, the root length, biomass and yield indexes of quinoa under mild salt stress were 35.71%, 15.48% and 4.60% higher than those of the control group (S0: no saline\|alkali and PAM), respectively, indicating that quinoa did have strong salt tolerance. When the saline\|alkali stress increased to a certain extent (S2 and S3 treatment), the morphological indexes of quinoa showed a significant downward trend. Compared with the control group, the root length and biomass of quinoa under severe saline\|alkali stress decreased the most, which decreased by 53.72% and 62.99% respectively. However, under the same degree of severe saline\|alkali stress, PAM0-10 treatment could alleviate the stress effect of saline\|alkali on the growth of quinoa. Compared with the control group, the root length and biomass indexes of quinoa decreased by 39.31% and 45.42%, respectively. Based on the comprehensive indexes, the effects of different PAM application methods on the growth indexes of quinoa under different saline\|alkali stress conditions showed that the effect of surface centralized application (PAM0-10) was the best (P<0.05). The membership function analysis showed that the growth of quinoa was alleviated under different treatment conditions as follows: S1>S2>S3, PAM0-10>PAM0-30>PAM10-20>PAM20-30, indicating that in the actual cultivation process, the method of concentrated application of PAM (0~10 cm) on the surface layer had the most obvious mitigation effect on the growth of quinoa under saline\|alkali stress. |