Abstract: This paper analyses the northward movement and activity of convective cloud clusters over the Bay of Bengal through May to June. Evidences show that the Low Latitude Plateau (LLP) rainfall is affected by the activity of convective cloud clusters to a great extent during the early summer. These clusters,which are likely to move to LLP,mainly occur in the northemmost of the Bay of Bengal and its eastern ocean and seacoast. The southwest stream accompanied by strong wind-speed centers is a desirable environment to northern movement,which have a good relation with the activity and position of the Western Pacific Subtropical High.