Abstract: This research carried out variance analysis and multiple comparison on yield of varieties in multpoint a year by using DPS, evaluated productivity and sability of watermelon varieties in Gravel-mulched Field according to yield results of eight watermelon varieties and four testing sites in regional trial in china. The results of variance analysis showed that three varieties(09-N7,09-N1and CK)are significantly different and three varieties(09-N7,09-N1and CK) reached extremely significant differences with other varieties. The results of productivity and sability of watermelon varieties showed that productivity and sability of 09-N1and 09-N7 were superior to the control, 09-N1and 09-N7 were high and stable yield varieties, productivity of 09-N9 was inferior to the control and sability of 09-N9 was superior to the control, 09-N9 was low and stable yield variety.