1) For the interchain coupling model of the quasi-one-dimensional organic ferromagnets, we use the two-step DMRG method to calculate the total energy, the spin configuration and the dimerization.

2) The variation of interchain potential in copolymer vinylidene fluoride with trifluoroethylene during chain rotation was calculated.

3) Interchain interactions. The polymer chains can be free to slide past one another (thermo-plastic) or they can be connected to each other with crosslinks (thermoset or elastomer).

4) The long spacing is approximated as 110A, the interchain distance along the direction normal to the chains in random folded-chain layer average 4.6A.

5) We mainly concentrate on the influence of interchain Heisenberg interaction and interchain DM interaction on system dimerization.

6) The impurity potential and interchain coupling integral have been calculated.

7) Polyacetylene and polyaniline usually have one-dimensional character because their interchain coupling interaction is weak.

8) Considering the electron-electron interactions, the configurations of electron and spin in an interchain coupled quasi-one-dimensional organic polymer ferromag(?)et are studies.