Several mesomorphic functionalized ladderlike polysiloxanes (LDPS) are presented. They are including: "fishbonelike"liquid crystalline polymers (FBLCPs) containing β - diketone

imine azo - three types of mesogenic side chains and corresponding metal - coordinating LCPs

and chromophore -bearing nonlinear optical (NLO) LDPS. They have been synthesized via hydrosilylation reaction from reactive polyhydro - silsesquioxane or its copolymers and functional monomers. Polymer network liquid crystal (PNLC) composites composed of FBLCP and low mass liquid crystal exhibited interesting electro - optical behavior: "positive" or "negative "effects depending on the "anchoring effect "and elastisity. The poled thin film of ladderlike NLO polymers demonstrated stable poling induced orietation. One of the common morphological feature of these mesomorphic LDPSs is birefrigent light bands which are stable at elevated temperature. Size - controllable cage - like supermolecular self - assemble membrane and its molecular level hybrid with organic molecules is another development based on the "stepwise coupling polymerization".