An effective Form-finding method for Form-fixed spatial network structures is presented in this paper. The adaptive Formfindingmethod is introduced along with the example of designing an ellipsoidal network dome with bar length variationsbeing as small as possible. A typical spherical geodesic network is selected as an initial state, having bar lengths in a limitgroup number. Next, this network is transFormed into the ellipsoidal shape as desired by applying compressions on barsaccording to the bar length variations caused by transFormation. Afterwards, the dynamic relaxation method is employed toexplicitly integrate the node positions by applying residual forces. During the Form-finding process, the boundary conditionof constraining nodes on the ellipsoid surface is innovatively considered as reactions on the normal direction of the surface atnode positions, which are balanced with the components of the nodal forces in a reverse direction induced by compressionson bars. The node positions are also corrected according to the fixed-Form condition in each explicit iteration step. In theserial results of time history, the optimal solution is found from a time history of states by properly choosing convergencecriteria, and the presented Form-finding procedure is proved to be applicable for Form-fixed problems.