www.neuron.yale.edu

I would like to find values for internal parameters in the standard HH model, like gNa, gK, and gL that will fit a desire voltage curve.
Is it possible to use the MRF to fit the desired voltage curve of the standard HH neuron? I read the MRF examples and still confused if it is possible to do with the MRF.
In this project http://www.mackelab.org/sbi/tutorial/02_HH_simulator/, their Python toolbox find one possible values of gNa and gK to fit the desire voltage curve.

Is it possible to use the MRF to fit the desired voltage curve of the standard HH neuron?

Yes. You might find these ModelDB entries interesting:
modeldb.yale.edu/3342
modeldb.yale.edu/3793

Thank you Ted for your answer.
I'm novel in using Neuron and the examples you linked are too cumbersome. Is there a simpler example of using the MRF that related to my question? The tutorial on the website doesn't explain how to use an internal variable from a model or how to run the model from MRF.

That's all the MultiRunFItter tutorials of which I am aware. The two ModelDB entries are examples of practical application of the MRF to research problems (specifically, fitting a model to experimental results recorded from a spiking neuron). Maybe you'd be interested in BluePyOpt https://www.frontiersin.org/article/10. ... 2016.00017, which is available from https://github.com/BlueBrain/BluePyOpt