Abstract: The greening conditions of 13 main roads in Beilin District， Suihua City，Heilongjiang Province，are investigated，the greening section forms and vertical structure of roads were analyzed，and the tree species frequency，green rate，tree species richness index，Simpson index，Shannon-Weiner index，Pielou index and greening isolation degree is calculated. The results show that：① There are a total of 12 road greening sections with one-board-two-belt type ， accounting for 92. 31% of the total number of roads surveyed. Only Zhongzhi road is three-board-four-belt type ，and the form is relatively simple. ② There are 9 families，13 genera and 17 species of tree species. Populus simonii had the highest relative frequency in arbors，reaching 31. 99%，and the relative frequency of Amygdalus triloba is the highest in shrubs， reaching 38. 62%. The green rate of Kangzhuang road is the highest，reaching 68. 04%. ③ The tree species richness of Huanghe road is highest（13），and that of Guang'an street was lowest（4）. The Simpson index and Shannon-Weiner index of Huanghe road reach the highest value，and the Pielou index of Guangshun street reaches the highest value. ④ In the vertical structure of road greening，the form of ″ Arbor + Shrub″ accounts for the largest proportion，reaching 53. 85%. Only Guangshun street is in the form of ″ Arbor″ . ⑤ The greening isolation degree of Zhongzhi road is 2. 4，and the other road is 0，so the isolation effect is relatively poor.

Key words: road greening, diversity index, frequency, green rate, Beilin District of Suihua City