Abstract: Here, we systematically study the effect and influence of different sludge fertilizer condition on the yield and the Chlorophyll fluorescence characters of soybean using the arid awning according to the 20 years's rainfall amount of Luoyang (from 1971-1999), accounting for the mean annual precipitation by the weighted value of every month to carry on the assignment, The result suggested that:F₀ and F_m values were larger and also show higher fluctuation between treatments in the full-bloom stage, while in the pod and seed filling stage, it shown gentle, less difference among the treatments. F_v value changes highly in different period, which indicate that F_v was influenced obviously by water and fertilizer. F_v/F_m and F_v/F₀ showed the same trend, the pod>seed filling stage>flowering stage, while F_v/F_m and F_v/F₀ of N_52.5P₅₆W_382.5 were higher in each growth period, indicating that this water and fertilizer coupling is more appropriate for the growth of the soybean. The different rainfall and fertilizer combinations show the following rule obviously:when N and P level in the same situation, output is increasing with the increase of the moisture content; In dry years and wet years, when P fertilizer is keeping the same content, higher N fertilizer produces higher yield, but no significance between treatments; In the average level of annual rainfall situation, different fertilization shows the different changes. To conclude, the water is the dominant factor of production and yield improvement is achieved through increasing the number of pods per plant and seed weight.