Information on the agriculture in Hanoi (capital city) and Ho Chi Minh City is given with the contribution of the peri-urban agriculture to the supply of the cities. Emphasis has been put on vegetable production in peri-urban area of Hanoi and its constraints. Constraints identified are : quality of the vegetable products and supply seasonality of the Hanoi's market. Seasonality is the constraint discussed in this paper. Strategies of the farmers based on diversification, and institutional activities based on innovative technologies transfers are the solutions adopted to overcome this constraint. Further development are proposed for a better management of rural - urban productions complementarity in the supply of the urban markets and new technology transfers.