Could you please provide a minimal runnable program example to
show the problem? Thanks.

package main

import (
"encoding/csv"
"log"
"os"
)

func main() {
f, err := os.Open("abc.csv")
if err != nil {
log.Println(err)
}
defer f.Close()
r := csv.NewReader(f)
r.LazyQuotes = true
r.TrimLeadingSpace = true
for {
line, err := r.Read()
if err != nil {
log.Println(err.Error())
break
}
log.Println(line)
}
}

=================abc.csv==================
"RSCP[-65dbm,-60dbm)" , "RSCP[-70dbm,-65dbm)"

That is not a minimal example. NewReader isn't even defined, and you don't use the csv package at all.

Maybe you meant this: http://play.golang.org/p/Ez7uyrmoj2

Which yields:

record with 1 values: ["RSCP[-65dbm,-60dbm)\" , \"RSCP[-70dbm,-65dbm)"]

Whereas if you trim the whitespace around the comma, it says:

record with 2 values: ["RSCP[-65dbm,-60dbm)" "RSCP[-70dbm,-65dbm)"]

sorry, I put the code modify good, you look at.
I gave reader.go a copy is made to locate the problem, forgot to change references.

I believe this is working as intended. If a field is quoted it must be quoted in its entirety. Putting spaces around the comma puts spaces into the field, and it means the quote no longer appears at the end, so the field is not quoted.

See RFC 4180, bottom of page 2, for a grammar. It makes this very precise.