Stellera chamaejasme L spread threatens productivity, conservation and ecological sustainability in wide range of meadows and grasslands on the Tibetan Plateau of China, it has become one of the most serious weeds threatening a widerange of grasslands, which were grazed heavily. In recent years, distribution of the Stellera chamaejasme have expanded and there formed severe degraded grassland in some high altitude area. Therefore, it is extremely important to understand their biologic characters of the population distribution that are in the different altitude. It is critical for revealing the cause and mechanism of population diffusion. The experiments were conducted in degraded alpine grassland in the upper reaches of Shiyang river, Gansu Province, China.In August 2012, at the same aspect and slope of the sample by selecting different altitudes(2700-3000 m), every 100 meters to set up a plot, set up four plot, plot area of 2 m×2 m, with 1 m×1 m sample box (box-like area of the small squares 10 cm × 10 cm) placed 4 times at a certain order of sampling, record every individual branches, ground projection and relative position, setted upⅠdegree cluster(1-10 branches)、Ⅱdegree cluster(11-20 branches)、 Ⅲdegree cluster(21-30 branches)、Ⅳdegree cluster(above 30 branches) under Stellera chamaejasme branch number. The measured value L(d) and the value of upper and lower envelopes were calculated by the Visual Fortran 6.5 based on the coordinate getting by GetData Graph Digitizer 2.22, Origin 7.5 was used as the plot software, this plot in the lower left corner coordinate origin to the intersection, using the step of 5 cm, the number of Monte-Carlo stochastic simulation is 20 times, dashed line are the 95% confidence envelops for the same process. The results showed that: Ⅰ、Ⅱdegree Stellera chamaejasme cluster reduced, Ⅲ、Ⅳ degree Stellera chamaejasme cluster increased with the altitude escalate; Ⅲ、Ⅳ degree Stellera chamaejasme cluster mainly random distribute in each altitude, whileⅠ、Ⅱdegree Stellera chamaejasme cluster small-scale showed aggregated distribution in low-elevation, aggregation intensity increase, scale decreases with the altitude escalate, showed random distribution in larger scale; Ⅰdegree Stellera chamaejasme cluster and Ⅲ、Ⅳ degree Stellera chamaejasme cluster、Ⅱdegree Stellera chamaejasme cluster and Ⅳ degree Stellera chamaejasme cluster showed positive relationship in small scale, positive relationship emerged scale reduced with the altitude escalate. Stellera chamaejasme population possess apparent response mechanism to environmental change, by each other shield、reduce propagation、weaken intraspecific competition and enhance aggregate strength realize survival and reproduction.