Several levels of microstructure - controllable ordered network polymers can be prepared by a new synthesis method called" stepwise coupling polymerization" . These orderer netword polymers include: soluble one - dimensional ladderlike or tubular polymers

and insoluble two - or three - dimensional sieve - plate - like network polymers. Novel reactive ladderlike polysilsesquioxanes including H - T

Vi - T or Allyl - T

EtO -T and its copolymers are important precursors of functional ladderlike polymers such as fishbonelike (FB) LCPs

rowboatlike NLO and LCPs

disclike metal - coordinated FBLCPs and tubular polysiloxanes . The interesting exploration on the applications of functional ladderlike polysiloxanes includes polymer - network liquid crystal (PNLC) film used for stablized liquid crystal display

active command layer used for photoregulation of liquid crystal alignment

the LC orietation film with controllable pretilt angle

new SHG nonlinear optical film with good low decay and conductive film based on self - assemling from discodic metal - coordinated units connected with ladderlike backbone •••The important progress in preparation of tubular polysiloxane and its supermolecular assemblies predicted a colorful future in application as nanoscale sensors or reactors with special molecular recorgnition and selections.