Abstract:On the basis of the linear relationship between mean crowding m and vatiance(v), a new model to be used for examining insect population spatial pattern and sampling technique is presented by auther in this paper, i·e m-v model (m=φ+ψv). In general, the linear related degtee of m and v is better than m and m. As the (m=φ+ψv) is linear, the estimated values of φand ψ can offer different informatin concerning the spatial pattern of insect population. (1)φ=0, ψ=1, random distribution. (2)φ>0, ψ<1, aggregation distribution. (3)when the m<1 and v>m/(1-m), φ>0, ψ>1, aggregation distribution. uniform distribution. according to the m-v model and the Lloyd‘s mean crowding formula (m=v/m+m-1), the auther derived a set of new math formula for sampling insect population. they are: (1) the boundary equation of sequential sampling, (2) a formula of determining maximum sampling number, (3) a formula for selecting the opitimum sample unit size of a sample.