Use of plant based drugs and chemicals for curing various ailments and personal adornment is as old as human civilization. Plants and plant based medicines are the basis of many of the modern pharmaceuticals. The aim of the present study is finding out the bioactive chemical constituents and to evaluate the antiasthma activity of Evolvulus alsinoides. L medicinal plant extract. This study involves the preliminary phytochemical screening separation and Identification of compounds. The results reveal that the presence of phenols, tannins, saponins, pseudo tannins, flavonoids, saponins, glycosides, steroids, steroidal glycosides, terpenoids, and alkaloids were detected in the selected plant tested. The extract also was tested for antiasthma activity and shows significant activity.