Abstract: For researching the optimal density and model of the sugercane interplant potato to maximize production efficiency, using the three replicated randomized block experiment for the test. The rowledge of suger was 1.1 m and the potato planting distance was 0.20 m, 0.25 m, 0.30 m, 0.35 m, respectively. The economic yield and compound production was analysis under different processing conditions. Results showed that, the potato yield increased with the increase of planting density and the output vary from 20100.00 kg/hm2 to 27670.05 kg/hm2. Sugarcane production along with the increase of potato planting density reduced and the output vary from 147510.00 kg/hm2 to 176220.00 kg/hm2. The interplanting composite output increased by 34.48%-42.24% per unit area and reached extremely significant level. The output of two crops and land composite value was the highest at the potato planting distance was 0.25 m to 0.30 m.