Abstract: The test of increase yield was conducted by two different genotype and phenotype single-cross varieties interplanted at 2：2and 4：4. The results showed that the different maize varieties could significantly increase yield, but the increase rate of different varieties had different range, there increase yield of three combination of test was in 4.56 %-8.06 % . Analysis of factors on yield suggested that Hundred-grain weight and grain number of spike increased were two major factors of reasonable interplanting.