We have already reported the resist using a ring opened polymer of maleic anhydride unit (ROMA). The synthesis of the ROMA polymer is as follows: 1)copolymerization of cycloolefin derivatives and maleic anhydride 2)ring opening reaction of maleic anhydride unit. 3)substitution reaction of pendant group. The ROMA Polymer has several good properties such as UV transmittance, pattern profile, PED stability and storage stability. Especially, we have been known that the resist using a ROMA polymer has a good character for application of Resist Flow Process(RFP), recently. The ROMA polymer has shown various Tg value ranging from 100°C to 170°C in accordance with substituents and substituted degree. The resist made by ROMA polymer as a matrix resin showed a good lithographic performance at direct C/H pattern. We also got a good C/H pattern profile by resist flow process at sub-100nm hole size. In this study we will discuss about it and illustrate about various Tg value of ROMA polymers and data gotten by means of resist flow process.