Got it!Thanks for your answer and opinion.I'll think about it!

Thanks for your replying.Yes, assumption of extrapolation is available.And I also wonder that in practice, which assumption of extrapolation is used commonly when building a curve like this.Many thanks again.

<t>This is Arnold Lin, a new learner in finance.I'm trying to build a 30-year CNY zero curve by China swap rate (for pricing a callable corporate bond).But I could only find the swap rate within 10 years.The only idea that comes out from me is using the Treasury data in China but it doesn't make sen...